Google Wonder Wheel
google.com
google.com
I find it interesting that Google continues to hide these in a user-initiated sidebar in the interest of "sparse", while Y! and Bing now show search refinements by default.
"Wagon wheel" is a better metaphor -- I know what that is.
Not ever so easy since you can only go via the links offered, but I went presidents -> high schools named after presidents -> school athletic districts -> normal districts -> cities, and then the breakthrough change from City of Murphy (a place) to City of Heroes (a computer game) and from there to City of Villains, Batman Villains, Batman films, Actors.
Er, yes. anyway. cough.
That's an unofficial spam blog.